diff --git a/index.html b/index.html
index cef91f3..81a0437 100644
--- a/index.html
+++ b/index.html
@@ -203,6 +203,12 @@
                 <p>I'll show you 7 groups of numbers. For each group, tell me if your number is included.</p>
                 <p>After all 7 groups, I'll magically tell you your number! 🎩✨</p>
             </div>
+            <div style="margin: 20px 0;">
+                <label style="display: flex; align-items: center; justify-content: center; gap: 10px; font-size: 1.1em; color: #555;">
+                    <input type="checkbox" id="randomizeToggle" style="transform: scale(1.2);">
+                    Randomize numbers within groups
+                </label>
+            </div>
             <button class="btn btn-primary" onclick="startGame()">Start Game</button>
         </div>
 
@@ -228,7 +234,7 @@
         let currentGroup = 0;
         let groups = [];
 
-        function generateNumberGroups(maxNumber = 100) {
+        function generateNumberGroups(maxNumber = 100, shouldRandomize = false) {
             const generatedGroups = [];
             let bitPosition = 0;
             
@@ -249,11 +255,31 @@
                 [generatedGroups[i], generatedGroups[j]] = [generatedGroups[j], generatedGroups[i]];
             }
             
+            if (shouldRandomize) {
+                // Shuffle numbers within each group but keep first number in place
+                generatedGroups.forEach(group => {
+                    if (group.length > 1) {
+                        const firstNumber = group[0];
+                        const remainingNumbers = group.slice(1);
+                        
+                        // Shuffle the remaining numbers
+                        for (let i = remainingNumbers.length - 1; i > 0; i--) {
+                            const j = Math.floor(Math.random() * (i + 1));
+                            [remainingNumbers[i], remainingNumbers[j]] = [remainingNumbers[j], remainingNumbers[i]];
+                        }
+                        
+                        // Reconstruct the group with first number in place
+                        group.splice(1, group.length - 1, ...remainingNumbers);
+                    }
+                });
+            }
+            
             return generatedGroups;
         }
 
         function startGame() {
-            groups = generateNumberGroups(100);
+            const shouldRandomize = document.getElementById('randomizeToggle').checked;
+            groups = generateNumberGroups(100, shouldRandomize);
             currentGroup = 0;
             result = 0;